olebedev/when

Health v2 · maintenance only

Adoption not part of the score

1461 stars · 93 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

when is a Go library that parses natural language date and time expressions like 'tonight at 11:10 pm' or 'next tuesday 14:00' into concrete timestamps. It uses pluggable rules and merge strategies, with support for English, Russian, Brazilian Portuguese, Chinese, and Dutch.

Use cases

• parse dates from natural language text in Go
• extract datetime from user input like 'next friday at 3pm'
• build a reminder or scheduling feature that understands phrases
• convert phrases like 'tonight at 11:10 pm' to timestamps
• parse multilingual date expressions including Russian and Chinese
• find date mentions inside free-form chat messages

When to choose

• you need a Go library for natural language date parsing
• you want pluggable, extensible parsing rules
• you need multilingual date parsing (EN, RU, BR, ZH, NL)
• you want a lightweight alternative to heavyweight NLP services

When to avoid

• you need date parsing in a language other than Go
• you need languages beyond the five supported ones
• you need full NLP entity extraction beyond dates and times

Facets

library · maturity active

parser nlp date-time parsers developer-tools go cross-platform natural-language-dates pluggable-rules multilingual golang-library natural-language-processing

Member repositories

For agents

markdown · JSON · MCP: product_card(name="olebedev/when")